[857] | 1 | #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED
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| 2 | #define BOOST_SHARED_PTR_132_HPP_INCLUDED
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| 3 |
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| 4 | //
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| 5 | // shared_ptr.hpp
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| 6 | //
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| 7 | // (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
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| 8 | // Copyright (c) 2001, 2002, 2003 Peter Dimov
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| 9 | //
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| 10 | // Distributed under the Boost Software License, Version 1.0. (See
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| 11 | // accompanying file LICENSE_1_0.txt or copy at
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| 12 | // http://www.boost.org/LICENSE_1_0.txt)
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| 13 | //
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| 14 | // See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation.
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| 15 | //
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| 16 |
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| 17 | #include <boost/config.hpp> // for broken compiler workarounds
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| 18 |
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| 19 | #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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| 20 | #include <boost/serializaition/detail/shared_ptr_nmt_132.hpp>
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| 21 | #else
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| 22 |
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| 23 | #include <boost/assert.hpp>
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| 24 | #include <boost/checked_delete.hpp>
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| 25 | #include <boost/throw_exception.hpp>
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| 26 | #include <boost/detail/workaround.hpp>
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| 27 |
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| 28 | #include <boost/serialization/access.hpp>
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| 29 | #include <boost/serialization/detail/shared_count_132.hpp>
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| 30 |
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| 31 | #include <memory> // for std::auto_ptr
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| 32 | #include <algorithm> // for std::swap
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| 33 | #include <functional> // for std::less
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| 34 | #include <typeinfo> // for std::bad_cast
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| 35 | #include <iosfwd> // for std::basic_ostream
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| 36 |
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| 37 | #ifdef BOOST_MSVC // moved here to work around VC++ compiler crash
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| 38 | # pragma warning(push)
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| 39 | # pragma warning(disable:4284) // odd return type for operator->
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| 40 | #endif
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| 41 |
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| 42 | namespace boost_132 {
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| 43 |
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| 44 | #if !BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x560) )
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| 45 | using namespace boost;
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| 46 | #endif
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| 47 |
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| 48 | template<class T> class weak_ptr;
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| 49 | template<class T> class enable_shared_from_this;
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| 50 |
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| 51 | namespace detail
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| 52 | {
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| 53 |
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| 54 | struct static_cast_tag {};
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| 55 | struct const_cast_tag {};
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| 56 | struct dynamic_cast_tag {};
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| 57 | struct polymorphic_cast_tag {};
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| 58 |
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| 59 | template<class T> struct shared_ptr_traits
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| 60 | {
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| 61 | typedef T & reference;
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| 62 | };
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| 63 |
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| 64 | template<> struct shared_ptr_traits<void>
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| 65 | {
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| 66 | typedef void reference;
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| 67 | };
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| 68 |
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| 69 | #if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
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| 70 |
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| 71 | template<> struct shared_ptr_traits<void const>
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| 72 | {
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| 73 | typedef void reference;
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| 74 | };
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| 75 |
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| 76 | template<> struct shared_ptr_traits<void volatile>
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| 77 | {
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| 78 | typedef void reference;
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| 79 | };
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| 80 |
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| 81 | template<> struct shared_ptr_traits<void const volatile>
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| 82 | {
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| 83 | typedef void reference;
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| 84 | };
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| 85 |
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| 86 | #endif
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| 87 |
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| 88 | // enable_shared_from_this support
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| 89 |
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| 90 | template<class T, class Y> void sp_enable_shared_from_this( shared_count const & pn, enable_shared_from_this<T> const * pe, Y const * px )
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| 91 | {
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| 92 | if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
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| 93 | }
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| 94 |
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| 95 | inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
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| 96 | {
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| 97 | }
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| 98 |
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| 99 | } // namespace detail
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| 100 |
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| 101 |
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| 102 | //
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| 103 | // shared_ptr
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| 104 | //
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| 105 | // An enhanced relative of scoped_ptr with reference counted copy semantics.
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| 106 | // The object pointed to is deleted when the last shared_ptr pointing to it
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| 107 | // is destroyed or reset.
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| 108 | //
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| 109 |
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| 110 | template<class T> class shared_ptr
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| 111 | {
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| 112 | private:
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| 113 | // Borland 5.5.1 specific workaround
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| 114 | typedef shared_ptr<T> this_type;
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| 115 |
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| 116 | public:
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| 117 |
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| 118 | typedef T element_type;
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| 119 | typedef T value_type;
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| 120 | typedef T * pointer;
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| 121 | typedef typename detail::shared_ptr_traits<T>::reference reference;
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| 122 |
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| 123 | shared_ptr(): px(0), pn() // never throws in 1.30+
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| 124 | {
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| 125 | }
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| 126 |
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| 127 | #if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) )
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| 128 | template<class Y>
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| 129 | explicit shared_ptr(Y * p): px(p), pn(p,boost::checked_deleter<Y>()) // Y must be complete
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| 130 | #else
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| 131 | template<class Y>
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| 132 | explicit shared_ptr(Y * p): px(p), pn(p, checked_deleter<Y>()) // Y must be complete
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| 133 | #endif
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| 134 | {
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| 135 | detail::sp_enable_shared_from_this( pn, p, p );
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| 136 | }
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| 137 |
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| 138 | //
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| 139 | // Requirements: D's copy constructor must not throw
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| 140 | //
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| 141 | // shared_ptr will release p by calling d(p)
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| 142 | //
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| 143 |
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| 144 | template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
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| 145 | {
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| 146 | detail::sp_enable_shared_from_this( pn, p, p );
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| 147 | }
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| 148 |
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| 149 | // generated copy constructor, assignment, destructor are fine...
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| 150 |
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| 151 | // except that Borland C++ has a bug, and g++ with -Wsynth warns
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| 152 | #if defined(__BORLANDC__) || defined(__GNUC__)
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| 153 |
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| 154 | shared_ptr & operator=(shared_ptr const & r) // never throws
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| 155 | {
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| 156 | px = r.px;
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| 157 | pn = r.pn; // shared_count::op= doesn't throw
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| 158 | return *this;
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| 159 | }
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| 160 |
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| 161 | #endif
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| 162 |
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| 163 | template<class Y>
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| 164 | explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw
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| 165 | {
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| 166 | // it is now safe to copy r.px, as pn(r.pn) did not throw
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| 167 | px = r.px;
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| 168 | }
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| 169 |
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| 170 | template<class Y>
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| 171 | shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
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| 172 | {
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| 173 | }
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| 174 |
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| 175 | template<class Y>
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| 176 | shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
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| 177 | {
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| 178 | }
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| 179 |
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| 180 | template<class Y>
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| 181 | shared_ptr(shared_ptr<Y> const & r, detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
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| 182 | {
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| 183 | }
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| 184 |
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| 185 | template<class Y>
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| 186 | shared_ptr(shared_ptr<Y> const & r, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
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| 187 | {
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| 188 | if(px == 0) // need to allocate new counter -- the cast failed
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| 189 | {
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| 190 | pn = detail::shared_count();
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| 191 | }
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| 192 | }
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| 193 |
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| 194 | template<class Y>
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| 195 | shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
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| 196 | {
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| 197 | if(px == 0)
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| 198 | {
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| 199 | boost::throw_exception(std::bad_cast());
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| 200 | }
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| 201 | }
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| 202 |
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| 203 | #ifndef BOOST_NO_AUTO_PTR
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| 204 |
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| 205 | template<class Y>
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| 206 | explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
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| 207 | {
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| 208 | Y * tmp = r.get();
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| 209 | pn = detail::shared_count(r);
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| 210 | detail::sp_enable_shared_from_this( pn, tmp, tmp );
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| 211 | }
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| 212 |
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| 213 | #endif
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| 214 |
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| 215 | #if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
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| 216 |
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| 217 | template<class Y>
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| 218 | shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
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| 219 | {
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| 220 | px = r.px;
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| 221 | pn = r.pn; // shared_count::op= doesn't throw
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| 222 | return *this;
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| 223 | }
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| 224 |
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| 225 | #endif
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| 226 |
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| 227 | #ifndef BOOST_NO_AUTO_PTR
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| 228 |
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| 229 | template<class Y>
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| 230 | shared_ptr & operator=(std::auto_ptr<Y> & r)
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| 231 | {
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| 232 | this_type(r).swap(*this);
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| 233 | return *this;
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| 234 | }
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| 235 |
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| 236 | #endif
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| 237 |
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| 238 | void reset() // never throws in 1.30+
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| 239 | {
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| 240 | this_type().swap(*this);
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| 241 | }
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| 242 |
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| 243 | template<class Y> void reset(Y * p) // Y must be complete
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| 244 | {
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| 245 | BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors
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| 246 | this_type(p).swap(*this);
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| 247 | }
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| 248 |
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| 249 | template<class Y, class D> void reset(Y * p, D d)
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| 250 | {
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| 251 | this_type(p, d).swap(*this);
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| 252 | }
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| 253 |
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| 254 | reference operator* () const // never throws
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| 255 | {
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| 256 | BOOST_ASSERT(px != 0);
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| 257 | return *px;
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| 258 | }
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| 259 |
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| 260 | T * operator-> () const // never throws
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| 261 | {
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| 262 | BOOST_ASSERT(px != 0);
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| 263 | return px;
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| 264 | }
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| 265 |
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| 266 | T * get() const // never throws
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| 267 | {
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| 268 | return px;
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| 269 | }
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| 270 |
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| 271 | // implicit conversion to "bool"
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| 272 |
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| 273 | #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
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| 274 |
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| 275 | operator bool () const
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| 276 | {
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| 277 | return px != 0;
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| 278 | }
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| 279 |
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| 280 | #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
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| 281 | typedef T * (this_type::*unspecified_bool_type)() const;
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| 282 |
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| 283 | operator unspecified_bool_type() const // never throws
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| 284 | {
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| 285 | return px == 0? 0: &this_type::get;
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| 286 | }
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| 287 |
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| 288 | #else
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| 289 |
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| 290 | typedef T * this_type::*unspecified_bool_type;
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| 291 |
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| 292 | operator unspecified_bool_type() const // never throws
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| 293 | {
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| 294 | return px == 0? 0: &this_type::px;
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| 295 | }
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| 296 |
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| 297 | #endif
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| 298 |
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| 299 | // operator! is redundant, but some compilers need it
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| 300 |
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| 301 | bool operator! () const // never throws
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| 302 | {
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| 303 | return px == 0;
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| 304 | }
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| 305 |
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| 306 | bool unique() const // never throws
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| 307 | {
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| 308 | return pn.unique();
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| 309 | }
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| 310 |
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| 311 | long use_count() const // never throws
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| 312 | {
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| 313 | return pn.use_count();
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| 314 | }
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| 315 |
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| 316 | void swap(shared_ptr<T> & other) // never throws
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| 317 | {
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| 318 | std::swap(px, other.px);
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| 319 | pn.swap(other.pn);
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| 320 | }
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| 321 |
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| 322 | template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
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| 323 | {
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| 324 | return pn < rhs.pn;
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| 325 | }
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| 326 |
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| 327 | void * _internal_get_deleter(std::type_info const & ti) const
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| 328 | {
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| 329 | return pn.get_deleter(ti);
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| 330 | }
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| 331 |
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| 332 | // Tasteless as this may seem, making all members public allows member templates
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| 333 | // to work in the absence of member template friends. (Matthew Langston)
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| 334 |
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| 335 | #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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| 336 |
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| 337 | private:
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| 338 |
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| 339 | template<class Y> friend class shared_ptr;
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| 340 | template<class Y> friend class weak_ptr;
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| 341 |
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| 342 |
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| 343 | #endif
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| 344 | public: // for serialization
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| 345 | T * px; // contained pointer
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| 346 | detail::shared_count pn; // reference counter
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| 347 |
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| 348 | }; // shared_ptr
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| 349 |
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| 350 | template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b)
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| 351 | {
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| 352 | return a.get() == b.get();
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| 353 | }
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| 354 |
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| 355 | template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b)
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| 356 | {
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| 357 | return a.get() != b.get();
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| 358 | }
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| 359 |
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| 360 | #if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
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| 361 |
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| 362 | // Resolve the ambiguity between our op!= and the one in rel_ops
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| 363 |
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| 364 | template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T> const & b)
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| 365 | {
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| 366 | return a.get() != b.get();
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| 367 | }
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| 368 |
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| 369 | #endif
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| 370 |
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| 371 | template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b)
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| 372 | {
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| 373 | return a._internal_less(b);
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| 374 | }
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| 375 |
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| 376 | template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b)
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| 377 | {
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| 378 | a.swap(b);
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| 379 | }
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| 380 |
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| 381 | template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const & r)
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| 382 | {
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| 383 | return shared_ptr<T>(r, detail::static_cast_tag());
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| 384 | }
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| 385 |
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| 386 | template<class T, class U> shared_ptr<T> const_pointer_cast(shared_ptr<U> const & r)
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| 387 | {
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| 388 | return shared_ptr<T>(r, detail::const_cast_tag());
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| 389 | }
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| 390 |
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| 391 | template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const & r)
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| 392 | {
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| 393 | return shared_ptr<T>(r, detail::dynamic_cast_tag());
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| 394 | }
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| 395 |
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| 396 | // shared_*_cast names are deprecated. Use *_pointer_cast instead.
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| 397 |
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| 398 | template<class T, class U> shared_ptr<T> shared_static_cast(shared_ptr<U> const & r)
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| 399 | {
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| 400 | return shared_ptr<T>(r, detail::static_cast_tag());
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| 401 | }
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| 402 |
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| 403 | template<class T, class U> shared_ptr<T> shared_dynamic_cast(shared_ptr<U> const & r)
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| 404 | {
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| 405 | return shared_ptr<T>(r, detail::dynamic_cast_tag());
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| 406 | }
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| 407 |
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| 408 | template<class T, class U> shared_ptr<T> shared_polymorphic_cast(shared_ptr<U> const & r)
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| 409 | {
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| 410 | return shared_ptr<T>(r, detail::polymorphic_cast_tag());
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| 411 | }
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| 412 |
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| 413 | template<class T, class U> shared_ptr<T> shared_polymorphic_downcast(shared_ptr<U> const & r)
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| 414 | {
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| 415 | BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
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| 416 | return shared_static_cast<T>(r);
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| 417 | }
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| 418 |
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| 419 | // get_pointer() enables boost::mem_fn to recognize shared_ptr
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| 420 |
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| 421 | template<class T> inline T * get_pointer(shared_ptr<T> const & p)
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| 422 | {
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| 423 | return p.get();
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| 424 | }
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| 425 |
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| 426 | // operator<<
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| 427 |
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| 428 | #if defined(__GNUC__) && (__GNUC__ < 3)
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| 429 |
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| 430 | template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
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| 431 | {
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| 432 | os << p.get();
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| 433 | return os;
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| 434 | }
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| 435 |
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| 436 | #else
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| 437 |
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| 438 | # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, <= 1200 && __SGI_STL_PORT)
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| 439 | // MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL
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| 440 | using std::basic_ostream;
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| 441 | template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, shared_ptr<Y> const & p)
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| 442 | # else
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| 443 | template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
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| 444 | # endif
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| 445 | {
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| 446 | os << p.get();
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| 447 | return os;
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| 448 | }
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| 449 |
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| 450 | #endif
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| 451 |
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| 452 | // get_deleter (experimental)
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| 453 |
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| 454 | #if (defined(__GNUC__) && (__GNUC__ < 3)) || (defined(__EDG_VERSION__) && (__EDG_VERSION__ <= 238))
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| 455 |
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| 456 | // g++ 2.9x doesn't allow static_cast<X const *>(void *)
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| 457 | // apparently EDG 2.38 also doesn't accept it
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| 458 |
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| 459 | template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
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| 460 | {
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| 461 | void const * q = p._internal_get_deleter(typeid(D));
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| 462 | return const_cast<D *>(static_cast<D const *>(q));
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| 463 | }
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| 464 |
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| 465 | #else
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| 466 |
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| 467 | template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
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| 468 | {
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| 469 | return static_cast<D *>(p._internal_get_deleter(typeid(D)));
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| 470 | }
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| 471 |
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| 472 | #endif
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| 473 |
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| 474 | } // namespace boost
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| 475 |
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| 476 | #ifdef BOOST_MSVC
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| 477 | # pragma warning(pop)
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| 478 | #endif
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| 479 |
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| 480 | #endif // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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| 481 |
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| 482 | #endif // #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED
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